js 数字加密

const crypto = require('crypto');

// 密钥和初始化向量（IV）
const key = crypto.randomBytes(16); // 128位密钥
const iv = crypto.randomBytes(16);  // 16字节IV

function encrypt(text) {
  let cipher = crypto.createCipheriv('aes-128-cbc', Buffer.from(key), iv);
  let encrypted = cipher.update(text);
  encrypted = Buffer.concat([encrypted, cipher.final()]);
  return { iv: iv.toString('hex'), encryptedData: encrypted.toString('hex') };
}

function decrypt(hash) {
  let iv = Buffer.from(hash.iv, 'hex');
  let encryptedText = Buffer.from(hash.encryptedData, 'hex');
  let decipher = crypto.createDecipheriv('aes-128-cbc', Buffer.from(key), iv);
  let decrypted = decipher.update(encryptedText);
  decrypted = Buffer.concat([decrypted, decipher.final()]);
  return decrypted.toString();
}

// 使用示例
let text = "Hello World";
let encrypted = encrypt(text);
console.log("Encrypted:", encrypted);

let decrypted = decrypt(encrypted);
console.log("Decrypted:", decrypted);

const hmac = crypto.createHmac('sha256', key);
hmac.update(text);
let hash = hmac.digest('hex');
console.log("HMAC:", hash);